Since 1979 Ideal Pet 96” Aluminum 2-Piece Modular Pet Patio Door with Single Pane Glass and Clear Flexible Flap, for Cats or Dogs, 7" x 11-1/4" Flap Size

Fairly easy to install and seems to be quite durable.I would recommend it.

Not as simple as instructions

I like the design of the upper springs so that the unit fits perfectly into the slider tracks.Cats cannot figure out how to push thru the flap, yet, but they will with some food incentive.Cats now love the lanai and chasing lizards across the pool deck.There was slight damage in shipping which needed pliers to correct 9very simple). Did like the design that made shipping easier as the overall size was very manageable.Did not mount permanently as I remove it when I leave the house (yes, I bring the cats in).

Our dogs are more happier now that they could go in and out of the apartment by themselves. Without this doggie door, the sliding glass window does not need to be open and no more bugs and flies gets into the apt.

A little expensive but well made. Would be nice if they had a gasket material on the side that meets the slider because the lock that rotates out causes about a quarter inch gap when closed

was easy to install